Urea pump and its anti-clogging control method, scr device, and urea injection system
A technology of urea dosing pump and control valve, which is applied in the direction of exhaust device, muffler device, electric control of exhaust gas treatment device, etc. Effect
Active Publication Date: 2022-04-05
WEICHAI POWER CO LTD +1
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Problems solved by technology
[0002] At present, when the urea injection system is in normal operation, if there is blockage caused by impurities at the filter element of the urea pump and the injection system cannot work normally, the control unit will give multiple instructions to restart the urea injection system. After several instructions, the urea injection system still cannot work normally, and the control unit will send out a urea pump failure signal and limit the torque of the vehicle. To unnecessary loss, and will affect the user's use
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Embodiment Construction
[0030] One of the cores of the present invention is to provide an urea pump to achieve the purpose of improving the reliability of urea pump due to the case where the urea pump caused by the clogging of the filter, improves the reliability of the urea pump, and improve the user experience.
[0031] Another core of the present invention is to provide a urea pump anti-blocking control method, urea injection system, and an SCR device including the urea pump described above.
[0032] Next, the technical solutions in the embodiments of the present invention will be described in connection with the drawings of the embodiments of the present invention, and it is understood that the described embodiments are merely the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art are in the range of the present invention without making creative labor premise.
[0033...
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The invention relates to a urea pump and its anti-clogging control method, an SCR device, and a urea injection system. The urea pump includes a first filter device, a first differential pressure detection device and a bypass pipeline, and the first filter device is arranged on the urea pump pipeline , the first differential pressure detection device is used to detect the pressure difference between the two ends of the first filter device; the bypass pipeline is connected in parallel with the first filter device, and a control valve is arranged on the bypass pipeline; the first differential pressure detection device and the control valve are respectively connected to the The controller of the urea pump is connected, and the controller of the urea pump controls the control valve to open when the first pressure difference detection device detects that the pressure difference between the two ends of the first filter device is greater than the preset value; Parallel bypass pipeline, when the first filter device is blocked, the system pressure can be built through the bypass pipeline, avoiding the occurrence of the urea pump being mistaken for a faulty part due to the blockage of the first filter device, reducing unnecessary loss, improve the reliability of the urea pump, and improve the user experience.
Description
Technical field [0001] The present invention relates to the technical field of diesel air management systems, and in particular, to urea pumps and their anti-blocking control methods and SCR devices, urea injection systems. Background technique [0002] At present, the urea injection system is in normal operation, if a plug in impurities formed at the filter element of the urea pump causes the injection system to operate normally, the control unit will repeat the urea injection system again, however the control unit issues a preset After the number of instructions, the urea injection system still does not work normally. The control unit will issue an urea pump fault signal and the vehicle is twisted. This situation will result in only the urea pump that needs to be replaced by the filter element is mistaken, and it is easy to bring the user. There is unnecessary losses and will affect users. Inventive content [0003] The first object of the present invention is to provide an ur...
Claims
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IPC IPC(8): F01N3/20F01N11/00
CPCF01N3/2066F01N3/208F01N11/00F01N2610/02F01N2610/1426F01N2610/144Y02T10/12Y02T10/40
Inventor 李晓光安丽花张言库
Owner WEICHAI POWER CO LTD